EP2230208A1 - Electroplating mould and method for manufacturing the same - Google Patents

Electroplating mould and method for manufacturing the same Download PDF

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Publication number
EP2230208A1
EP2230208A1 EP20100154909 EP10154909A EP2230208A1 EP 2230208 A1 EP2230208 A1 EP 2230208A1 EP 20100154909 EP20100154909 EP 20100154909 EP 10154909 A EP10154909 A EP 10154909A EP 2230208 A1 EP2230208 A1 EP 2230208A1
Authority
EP
European Patent Office
Prior art keywords
cavity
mold
layer
lower layer
electrically insulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20100154909
Other languages
German (de)
French (fr)
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EP2230208B1 (en
Inventor
Pierre Cusin
Clare Golfier
Jean-Philippe ThiƩbaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nivarox Far SA
Nivarox SA
Original Assignee
Nivarox Far SA
Nivarox SA
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Publication date
Application filed by Nivarox Far SA, Nivarox SA filed Critical Nivarox Far SA
Priority to EP20100154909 priority Critical patent/EP2230208B1/en
Publication of EP2230208A1 publication Critical patent/EP2230208A1/en
Application granted granted Critical
Publication of EP2230208B1 publication Critical patent/EP2230208B1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/10—Moulds; Masks; Masterforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B81—MICROSTRUCTURAL TECHNOLOGY
    • B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
    • B81C99/00—Subject matter not provided for in other groups of this subclass
    • B81C99/0075—Manufacture of substrate-free structures
    • B81C99/009—Manufacturing the stamps or the moulds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B81—MICROSTRUCTURAL TECHNOLOGY
    • B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
    • B81B2201/00—Specific applications of microelectromechanical systems
    • B81B2201/03—Microengines and actuators
    • B81B2201/035—Microgears

Definitions

  • the invention relates to a mold for manufacturing a micromechanical part by electroplating and its manufacturing process.
  • LIGA-type processes (well-known abbreviation from the German "rƶntgenLIthographie, Galvanoformung & Abformungā€) are more recent. They consist in forming a mold by photolithography of a photosensitive resin and then electroplating a metal deposit such as nickel. The accuracy of such LIGA processes is much better than that of a conventional mold obtained, for example, by machining. Such accuracies thus allow the manufacture of micromechanical parts especially for watch movements that were previously unthinkable.
  • the purpose of the present invention is to overcome all or part of the disadvantages mentioned above by proposing an alternative mold offering at least the same manufacturing precisions and authorizing the manufacture of multi-level and / or large-pitched parts.
  • the invention relates to a mold intended to manufacture a micromechanical part by electroplating, characterized in that it comprises a substrate comprising an upper layer and an electrically conductive lower layer joined together by an electrically insulating intermediate layer, the upper layer comprising at least one cavity revealing a portion of the lower layer of said substrate and having electrically insulating walls for growing an electrolytic deposit in said at least one cavity.
  • the invention relates to a method of manufacturing a micromechanical part 41, 41 ', 41 "by electroplating, method 1 preferably comprises a method of manufacturing a mold 39, 39', 39 "Follow the steps of electroplating 5 and release 7 of the part 41, 41 ', 41" of said mold.
  • the manufacturing process 3 of the mold comprises successive steps for manufacturing a mold 39, 39 ', 39 "preferably comprising silicon-based materials.
  • a first step 10 of the method 3 consists in providing a substrate 9, 9 'comprising an upper layer 21, 21' and a lower layer 23, 23 'made of electrically micro-machinable materials. conductors, secured together by an intermediate layer 22, 22 'electrically insulating as illustrated in FIGS. figures 1 and 8 .
  • the substrate 9, 9 ' is a S.O.I. (Well known abbreviation from the English term "Silicon On Isulator").
  • the upper layers 21, 21 'and lower 23, 23' are sufficiently doped crystalline silicon to be electrically conductive and the intermediate layer of silicon dioxide.
  • the method 3 comprises two distinct embodiments from the step 11 respectively represented by a triple line and a single line to the figure 13 .
  • a mask 15 and then a protective mask 24 are structured on the upper conductive layer 21 as illustrated in FIG. figure 2 .
  • the mask 15 comprises at least one pattern 27 which does not cover the upper layer 21.
  • the mask 24, which completely covers the mask 15 comprises at least one pattern 26 which does not cover the upper layer 21.
  • the mask 15 may be made by depositing a silicon oxide layer to form said mask to a predetermined height. Then, the mask 24 may, for example, be obtained by photolithography using a photoresist covering the mask 15.
  • the upper layer 21 is etched until the intermediate layer 22 is discovered.
  • the etching step 2 preferably comprises an anisotropic dry attack of the deep reactive ion etching type ( DRIE from the English term "Deep Reactive Ion Etching").
  • a first step of step 2 an anisotropic etching is carried out in the upper layer 21 according to the pattern 26 of the mask 24. This etching makes it possible to start the etching of at least one cavity 25 in the upper layer 21 on a part of its thickness.
  • a second step the mask 24 is removed and then a second anisotropic etching is carried out according to the pattern 27 of the mask 15 still present on the upper layer 21. The second etching makes it possible to continue the etching of said at least one cavity 25, but also of begin etching at least one recess 28 which communicates with said at least one cavity 25 while being of larger section.
  • a fourth step 4 the mask 15 is removed. So, as visible at the figure 3 at the end of the fourth step 4, the upper layer 21 is etched throughout its thickness of said at least one cavity 25 and on an upper part of its thickness of said at least one recess 28.
  • an electrically insulating coating 30 is deposited by covering the upper assembly of the substrate 9 as illustrated in FIG. figure 4 .
  • the coating 30 is obtained by oxidation of the top of the etched upper layer 21 and the intermediate layer 22.
  • Step 8 a directional etching of the coating 30 and the intermediate layer 22 is performed.
  • Step 8 is intended to limit the presence of insulating layers only at each vertical wall formed in the upper layer 21, that is to say the walls 31 and 32 respectively of said at least one cavity 25 and said least one recess 28.
  • the vertical component of the etching phenomenon is favored with respect to the horizontal composition, by modulating, for example, the pressure in the chamber (pressure work very low), in a RIE reactor.
  • Such an engraving may, for example, be of the "ion milling" or "sputter etchingā€ type.
  • step 8 the bottom of the cavity 25 discovers the lower layer 23 electrically conductive and the bottom of the recess 28 discovers the upper layer 21 also conductive.
  • an attachment layer on the bottom of each cavity 25 and / or on the bottom of each recess 28 may be provided.
  • the bonding layer could then consist of a metal such as CrAu alloy.
  • a rod 29 is mounted to directly form the axis hole 42 of the micromechanical part 41 during electroplating step 5.
  • This has the advantage not only of not having to machine part 41 after electroplating is completed but also to be able to make any shape of inner section, uniformly or otherwise, over the entire height of hole 42.
  • the rod 29 is obtained, for example, using a photolithography process of a photosensitive resin.
  • step 8 the manufacturing process 3 of the mold 39 is finished and the manufacturing process 1 of the micromechanical part continues with the electroplating and release 7 steps of FIG. the piece 41 of the mold 39.
  • the electroplating step 5 is carried out by connecting the deposition electrode to the lower layer 23 of the mold 39 so as to firstly grow an electrolytic deposit in the cavity 25 of said mold and then, only in a second step, in the 'recess 28 as illustrated in the figure 6 .
  • the electrolytic deposit when it is flush with the upper part of the cavity 25, it electrically connects the upper layer 21 by, optionally, its attachment layer, which allows the continuation of the growth of the deposit sure the assembly of the recess 28.
  • the invention allows the production of parts 41 with great slenderness, that is to say when the section of the cavity 25 is much smaller than that of the recess 28, avoiding the problems of delamination even with a nickel-phosphorus material at, for example, 12% phosphorus.
  • the manufacturing method 1 ends with step 7, in which the part 41 formed in the cavity 25 and then in the recess 28 is released from the mold 39.
  • the release step 7 can, for example, be performed by etching layers 23 and 21.
  • the micromechanical part 41 obtained has two levels 43, 45 of different shape each in a perfectly independent thickness and having a single pin hole 42.
  • Such a micromechanical part 41 could, for example, be a coaxial escapement wheel or an escape wheel assembly 43 - pinion 45 having a geometrical precision of the order of a micrometer but also an ideal referencing that is to say to say a perfect positioning between said levels.
  • the method 3 comprises a second step 11, consisting of structuring at least one mask 24 'of protection on the upper conductive layer 21' as illustrated in FIG. figure 8 .
  • the mask 24 ' has at least one pattern 26' which does not cover the upper layer 21 '.
  • Such a mask 24 'can for example, be obtained by photolithography using a photoresist.
  • the upper layer 21 ' is etched until discovering the intermediate layer 22'.
  • the etching step 12 preferably comprises an anisotropic dry etching of the deep reactive ion etching (DRIE) type. The anisotropic etching is performed in the upper layer 21 'according to the pattern 26' of the mask 24 '.
  • DRIE deep reactive ion etching
  • a fourth step 14 the mask 24 'is removed. So, as visible at the figure 9 at the end of the fourth step 14, the upper layer 21 'is etched throughout its thickness of at least one cavity 25'.
  • an electrically insulating coating 30 ' is deposited by covering the upper assembly of the substrate 9' as illustrated in FIG. figure 10 .
  • the coating 30 ' is obtained by oxidation of the top of the upper layer 21' etched and the intermediate layer 22 '.
  • Step 18 a directional etching of the coating 30 'and the intermediate layer 22' is carried out.
  • Step 18 is intended to limit the presence of insulating layers only at each vertical wall formed in the upper layer 21 ', that is to say the walls 31' of said at least one cavity 25 '.
  • an attachment layer on the bottom of each cavity 25 'and / or on the top of the upper layer 21' may be provided.
  • the bonding layer could then consist of a metal such as CrAu alloy.
  • a rod can be mounted to form directly the axis hole of the micromechanical part during electroplating step 5 with the same advantages as mentioned above.
  • step 18 the manufacturing method 3 of the mold 39 'is finished and the manufacturing process 1 of the micromechanical part continues with the electroplating and release steps 7 of the mold part 39 '.
  • Step 5 of electroplating is performed by connecting the deposition electrode to the lower layer 23 'of the mold 39' in order to grow an electrolytic deposit in the cavity 25 'of the mold 39'.
  • the manufacturing method 1 ends with the step 7 similar to that explained in the first embodiment, in which the piece formed in the cavity 25 'is released from the mold 39'.
  • the micromechanical part obtained has a single level of identical shape over its entire thickness and may include an axis hole.
  • Such a micromechanical part could, for example, be an escape wheel or an escapement anchor or even a pinion having a geometric precision of the order of a micrometer.
  • the manufacturing method 3 of the mold 39 ' has a further step 20 for forming at least a second level of the mold 39' as illustrated in FIG. figure 12 .
  • the second level is achieved by mounting a piece 27 ', having walls 32' electrically insulating, on the upper layer 21 'which has not been removed in step 12.
  • the added piece 27 ' forms at least one recess 28' of larger section than the removed portions 25 ', for example, using a photolithography process of a photoresist.
  • Exhibit 27 'could also include a insulating silicon material previously etched and then secured to the conductive layer 21 '.
  • step 20 the manufacturing method 3 of the mold 39 'is completed and the manufacturing process 1 of the micromechanical part continues with the steps of electroplating 5 and release 7 of the piece 41 'of the mold 39'.
  • the electroplating step 5 is carried out by connecting the deposition electrode to the lower layer 23 'of the mold 39' so as to initially grow an electrolytic deposit in the cavity 25 'of said mold, and then only in a second step in the recess 28 'as illustrated in FIG. figure 12 .
  • the electrolytic deposit when it is flush with the upper part of the cavity 25 ', it electrically connects the top layer 21' with, optionally, its attachment layer, which allows the continuation of the growth. depositing on the entire recess 28 '.
  • the invention allows the production of parts 41 'with great slenderness, that is to say when the section of the cavity 25' is much smaller than that of the recess 28 ', avoiding the problems of delamination even with a nickel-phosphorus material at, for example, 12% phosphorus.
  • the manufacturing method 1 ends in step 7 similar to that explained in the first embodiment, in which the piece 41 'formed in the mold 39' is released.
  • the micromechanical part 41 'obtained has two levels of shape each different to a perfectly independent thickness and may include a single pinhole.
  • Such a micromechanical part 41 'can consequently have the same shape as that obtained by the first embodiment and thus include a geometrical precision of the order of a micrometer but also an ideal referencing, that is to say a positioning perfect between said levels.
  • the variant remains identical to method 1 described above until step 8, 18 or 20 according to the embodiment used.
  • the starting point of method 1 will be the example of the first embodiment as illustrated in FIG. figure 13 in triple line.
  • the lower layer 23 is intended to be etched in order to form at least one second cavity 35 in the mold 39 ".
  • a deposit 33 has been made in a portion of the first cavity 25 to provide an electroplating starting layer.
  • this deposit 33 is carried out starting from step 5 to a predetermined thickness.
  • this deposit can be carried out according to another method.
  • variant of method 1 applies to the lower layer 23, steps 11, 12, 14, 16 and 18 of the second embodiment of method 3.
  • the method 3 comprises a new step 11, consisting of structuring at least one mask 34 on the lower conductive layer 23 as illustrated in FIG. figure 15 .
  • the mask 34 comprises at least one pattern 36 which does not cover the lower layer 23.
  • Such a mask 34 may, for example, be obtained by photolithography using a photoresist.
  • the layer 23 is etched according to the pattern 36 until the electrically conductive deposit 33 is discovered. Then the protective mask 34 is removed in a new step 14. Thus, as visible in FIG. figure 16 at the end of step 14, the bottom layer 23 is etched over its entire thickness with at least one cavity 35.
  • an electrically insulating coating 38 is deposited by covering the bottom assembly of the substrate 9 "as shown in FIG. figure 17 .
  • the coating 38 is obtained by depositing a silicon oxide on the top of the lower layer 23, for example, using a physical vapor deposition.
  • a new step 18 is not necessary if only one level is added to the mold 39. Otherwise, a directional etching of the coating 38 is performed
  • the new step 18 would be intended to limit the presence of insulating layer only at the level of each vertical wall 39 formed in the lower layer 23, that is to say the walls of said at least one cavity 35.
  • a new step 18 is performed only to remove the oxide layer present in the bottom of the at least one cavity 35.
  • a rod 37 can be mounted to directly form the hole 42 "axis of the micromechanical part 41" during the electroplating step 5 with the same advantages as mentioned above. .
  • the manufacturing method 3 of the mold 39 is finished and the manufacturing process 1 of the micromechanical part continues with the electroplating and release steps 7 preferably, if the rods 29 and 37 are respectively formed in the cavities 25 and 35, they are preferably aligned, preferably the rod 37 is obtained, for example, using a photolithography process of a photosensitive resin.
  • the electroplating step 5 is performed by connecting the deposition electrode to the lower layer 23 in order to grow an electrolytic deposit in the cavity 35 and also to continue the growth of the deposit in the cavity 25, then, only in a second step, in the recess 28 as illustrated in FIG. figure 18 .
  • the manufacturing method 1 ends with step 7, in which the part 41 "is released from the mold 39" as explained above.
  • the micromechanical part 41 "obtained has at least three levels 43", 45 ā€œand 47ā€ of different shape each in a perfectly independent thickness with a single axis hole 42 ".
  • Such a micromechanical part could, for example, be a coaxial escape wheel 43 ā€œ, 45ā€ with its pinion 47 ā€œor a mobile with three levels of teeth 43", 45 ā€œ, 47ā€ having a geometric precision of the micrometer order but also an ideal referencing that is to say a perfect positioning between said levels.

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Abstract

The process comprises supplying a substrate comprising an upper layer (21') and a lower layer (23') made of electrically conductive silicon-based material and fixed between each other by an electrically insulating intermediate layer (22'), etching a pattern in the upper layer up to the intermediate layer to form a cavity of a mold (39'), overlaying the upper part of the substrate with an electrically insulating coating, and etching the coating and the intermediate layer to limit their presence in each vertical wall (31') formed in the upper layer. A second pattern is etched to form a recess. The process comprises supplying a substrate comprising an upper layer (21') and a lower layer (23') made of electrically conductive silicon-based material and fixed between each other by an electrically insulating intermediate layer (22'), etching a pattern in the upper layer up to the intermediate layer to form a cavity of a mold (39'), overlaying the upper part of the substrate with an electrically insulating coating, and etching the coating and the intermediate layer for limiting their presence in each vertical wall (31') formed in the upper layer. A second pattern is etched to form a recess contacting the cavity to provide a second level to the upper layer. A rod is finally formed by photolithography in the cavity to form a hole in the future component formed in the mold. Independent claims are included for: (1) a process for manufacturing a micromechanical component; and (2) a mold for manufacturing a micromechanical component.

Description

Domaine de l'inventionField of the invention

L'invention se rapporte Ć  un moule destinĆ© Ć  fabriquer une piĆØce de micromĆ©canique par galvanoplastie ainsi que son procĆ©dĆ© de fabrication.The invention relates to a mold for manufacturing a micromechanical part by electroplating and its manufacturing process.

ArriĆØre plan de l'inventionBackground of the invention

La galvanoplastie est utilisĆ©e et connue depuis longtemps. Les procĆ©dĆ©s du type LIGA (abrĆ©viation trĆØs connue provenant de l'allemand Ā« rƶntgenLIthographie, Galvanoformung & Abformung Ā») sont plus rĆ©cents. Ils consistent Ć  former un moule par photolithographie d'une rĆ©sine photosensible puis d'y faire croĆ®tre par galvanoplastie un dĆ©pĆ“t mĆ©tallique comme du nickel. La prĆ©cision de tels procĆ©dĆ©s LIGA est bien meilleure que celle d'un moule classique obtenue, par exemple, par usinage. De telles prĆ©cisions autorisent ainsi la fabrication de piĆØces de micromĆ©canique notamment pour des mouvements horlogers qui Ć©taient avant inenvisageables.Electroplating is used and known for a long time. LIGA-type processes (well-known abbreviation from the German "rƶntgenLIthographie, Galvanoformung & Abformung") are more recent. They consist in forming a mold by photolithography of a photosensitive resin and then electroplating a metal deposit such as nickel. The accuracy of such LIGA processes is much better than that of a conventional mold obtained, for example, by machining. Such accuracies thus allow the manufacture of micromechanical parts especially for watch movements that were previously unthinkable.

Cependant, de tels procĆ©dĆ©s ne sont pas adaptĆ©s pour les piĆØces de micromĆ©canique Ć  grand Ć©lancement comme une roue d'Ć©chappement coaxiale en nickel - phosphore Ć , par exemple, 12% de phosphore. En effet, les dĆ©pĆ“ts Ć©lectrolytiques de ce type de piĆØce dĆ©laminent en cours de dĆ©pĆ“t en raison des contraintes internes du nickel - phosphore dĆ©posĆ© ce qui a pour consĆ©quence un dĆ©collement au niveau de son interface avec le substrat.However, such methods are not suitable for large slenderness micromechanical parts such as a nickel-phosphorus coaxial exhaust wheel with, for example, 12% phosphorus. In fact, the electrolytic deposits of this type of part delaminate during deposition because of the internal stresses of the deposited nickel - phosphor, which results in detachment at its interface with the substrate.

RƩsumƩ de l'inventionSummary of the invention

Le but de la prĆ©sente invention est de pallier tout ou partie les inconvĆ©nients citĆ©s prĆ©cĆ©demment en proposant un moule alternatif offrant au moins les mĆŖmes prĆ©cisions de fabrication et autorisant la fabrication de piĆØces Ć  plusieurs niveaux et/ou Ć  grand Ć©lancement.The purpose of the present invention is to overcome all or part of the disadvantages mentioned above by proposing an alternative mold offering at least the same manufacturing precisions and authorizing the manufacture of multi-level and / or large-pitched parts.

A cet effet, l'invention se rapporte Ơ un procƩdƩ de fabrication d'un moule comportant les Ʃtapes suivantes :

  1. a) se munir d'un substrat comportant une couche supƩrieure et une couche infƩrieure en matƩriau micro-usinable Ʃlectriquement conducteur et solidarisƩes entre elles par une couche intermƩdiaire Ʃlectriquement isolante ;
  2. b) graver au moins un motif dans la couche supƩrieure jusqu'Ơ la couche intermƩdiaire afin de former au moins une cavitƩ dudit moule ;
  3. c) recouvrir la partie supĆ©rieure dudit substrat d'un revĆŖtement Ć©lectriquement isolant ;
  4. d) graver de maniĆØre directionnelle ledit revĆŖtement et ladite couche intermĆ©diaire afin de limiter leur prĆ©sence uniquement au niveau de chaque paroi verticale formĆ©e dans ladite couche supĆ©rieure.
For this purpose, the invention relates to a method of manufacturing a mold comprising the following steps:
  1. a) providing a substrate comprising an upper layer and a lower layer of electrically conductive micro-machining material and secured to one another by an electrically insulating intermediate layer;
  2. b) etching at least one pattern in the upper layer to the intermediate layer to form at least one cavity of said mold;
  3. c) covering the upper portion of said substrate with an electrically insulating coating;
  4. d) directionally etching said coating and said intermediate layer to limit their presence only at each vertical wall formed in said top layer.

ConformƩment Ơ d'autres caractƩristiques avantageuses de l'invention :

  • un deuxiĆØme motif est gravĆ© lors de l'Ć©tape b) afin de former au moins un Ć©videment communiquant avec ladite au moins une cavitĆ© offrant Ć  ladite couche supĆ©rieure un deuxiĆØme niveau ;
  • une piĆØce est montĆ©e aprĆØs l'Ć©tape d) afin de former au moins un Ć©videment communiquant avec ladite au moins une cavitĆ© offrant audit moule un deuxiĆØme niveau ;
  • le procĆ©dĆ© comporte l'Ć©tape finale e) : monter une tige dans ladite au moins une cavitĆ© afin de former un trou dans la future piĆØce rĆ©alisĆ©e dans ledit moule ;
  • l'Ć©tape b) comporte les phases f) : structurer au moins un masque de protection sur la couche conductrice supĆ©rieure, g) : rĆ©aliser une attaque anisotrope de ladite couche supĆ©rieure selon les parties non recouvertes par ledit au moins un masque de protection et h) : retirer le masque de protection ;
  • le procĆ©dĆ© comporte, Ć  la suite des Ć©tapes prĆ©cĆ©dentes, les Ć©tapes a') : dĆ©poser un matĆ©riau Ć©lectriquement conducteur dans le fond de ladite au moins une cavitĆ©, b'): graver un motif dans la couche infĆ©rieure jusqu'au dĆ©pĆ“t dudit matĆ©riau conducteur afin de former au moins une cavitĆ© dudit moule et c'): recouvrir l'ensemble d'un deuxiĆØme revĆŖtement Ć©lectriquement isolant ;
  • le procĆ©dĆ© comporte, Ć  la suite de l'Ć©tape c'), l'Ć©tape d'): graver de maniĆØre directionnelle ledit deuxiĆØme revĆŖtement afin de limiter sa prĆ©sence uniquement au niveau de chaque paroi verticale formĆ©e dans ladite couche infĆ©rieure ;
  • un deuxiĆØme motif est gravĆ© lors de l'Ć©tape b') afin de former au moins un Ć©videment communiquant avec ladite au moins une cavitĆ© offrant Ć  ladite couche infĆ©rieure un deuxiĆØme niveau ;
  • une piĆØce est montĆ©e aprĆØs l'Ć©tape d') afin de former au moins un Ć©videment communiquant avec ladite au moins une cavitĆ© offrant audit moule un deuxiĆØme niveau ;
  • le procĆ©dĆ© comporte l'Ć©tape finale e'): monter une tige dans ladite au moins une cavitĆ© de la couche infĆ©rieure afin de former un trou dans la future piĆØce rĆ©alisĆ©e dans ledit moule ;
  • l'Ć©tape b') comporte les phases f) : structurer au moins un masque de protection sur la couche conductrice supĆ©rieure, g'): rĆ©aliser une attaque anisotrope de ladite couche supĆ©rieure selon les parties non recouvertes par ledit au moins un masque de protection et h'): retirer le masque de protection ;
  • plusieurs moules sont fabriquĆ©s sur le mĆŖme substrat ;
  • les couches conductrices comportent un matĆ©riau Ć  base de silicium dopĆ©.
According to other advantageous features of the invention:
  • a second pattern is etched in step b) to form at least one recess communicating with said at least one cavity providing said upper layer a second level;
  • a part is mounted after step d) to form at least one recess communicating with said at least one cavity providing said mold a second level;
  • the method comprises the final step e): mounting a rod in said at least one cavity to form a hole in the future part made in said mold;
  • step b) comprises the phases f): structuring at least one protective mask on the upper conductive layer, g): performing an anisotropic etching of said upper layer according to the non-conducting portions covered by said at least one protective mask and h): removing the protective mask;
  • the method comprises, following the preceding steps, the steps a '): depositing an electrically conductive material in the bottom of said at least one cavity, b'): etching a pattern in the lower layer until the deposition of said conductive material in order to form at least one cavity of said mold and c '): to cover the assembly with a second electrically insulating coating;
  • the method comprises, following step c '), the step of): directionally embossing said second coating to limit its presence only at each vertical wall formed in said lower layer;
  • a second pattern is etched in step b ') to form at least one recess communicating with said at least one cavity providing said lower layer a second level;
  • a piece is mounted after step d ') to form at least one recess communicating with said at least one cavity providing said mold a second level;
  • the method comprises the final step e '): mounting a rod in said at least one cavity of the lower layer to form a hole in the future part made in said mold;
  • step b ') comprises the phases f): structuring at least one protective mask on the upper conductive layer, g'): performing an anisotropic etching of said upper layer according to the parts not covered by said at least one protective mask and h '): remove the protective mask;
  • several molds are made on the same substrate;
  • the conductive layers comprise a doped silicon-based material.

L'invention se rapporte Ć©galement Ć  un procĆ©dĆ© de fabrication par galvanoplastie d'une piĆØce de micromĆ©canique, caractĆ©risĆ© en ce qu'il comprend les Ć©tapes suivantes :

  • i) fabriquer un moule selon le procĆ©dĆ© conforme Ć  l'une des variantes prĆ©cĆ©dentes ;
  • j) rĆ©aliser une Ć©lectrodĆ©position en connectant l'Ć©lectrode Ć  la couche conductrice infĆ©rieure du substrat afin de former ladite piĆØce dans ledit moule ;
  • k) libĆ©rer la piĆØce dudit moule.
The invention also relates to a method of manufacturing by electroplating a micromechanical component, characterized in that it comprises the following steps:
  • i) manufacturing a mold according to the method according to one of the preceding variants;
  • j) electroplating by connecting the electrode to the lower conductive layer of the substrate to form said part in said mold;
  • k) releasing the part of said mold.

Enfin, l'invention se rapporte Ć  un moule destinĆ© Ć  fabriquer une piĆØce de micromĆ©canique par galvanoplastie, caractĆ©risĆ© en ce qu'il comporte un substrat comportant une couche supĆ©rieure et une couche infĆ©rieure Ć©lectriquement conductrices solidarisĆ©es entre elle par une couche intermĆ©diaire Ć©lectriquement isolante, la couche supĆ©rieure comportant au moins une cavitĆ© dĆ©couvrant une partie de la couche infĆ©rieure dudit substrat et comportant des parois Ć©lectriquement isolantes permettant de faire croĆ®tre un dĆ©pĆ“t Ć©lectrolytique dans ladite au moins une cavitĆ©.Finally, the invention relates to a mold intended to manufacture a micromechanical part by electroplating, characterized in that it comprises a substrate comprising an upper layer and an electrically conductive lower layer joined together by an electrically insulating intermediate layer, the upper layer comprising at least one cavity revealing a portion of the lower layer of said substrate and having electrically insulating walls for growing an electrolytic deposit in said at least one cavity.

ConformƩment Ơ d'autres caractƩristiques avantageuses de l'invention :

  • la couche supĆ©rieure comporte en outre au moins un Ć©videment situĆ© communiquant avec ladite au moins une cavitĆ© et comportant des parois Ć©lectriquement isolantes permettant de continuer le dĆ©pĆ“t Ć©lectrolytique dans ledit au moins un Ć©videment aprĆØs avoir rempli ladite au moins une cavitĆ© ;
  • la couche infĆ©rieure comporte au moins une cavitĆ© dĆ©couvrant une partie de couche Ć©lectriquement conductrice dudit substrat et comportant des parois Ć©lectriquement isolantes permettant de faire croĆ®tre un dĆ©pĆ“t Ć©lectrolytique dans ladite au moins une cavitĆ© de la couche infĆ©rieure ;
  • la couche infĆ©rieure comporte en outre au moins un Ć©videment situĆ© communiquant avec ladite au moins une cavitĆ© de la couche infĆ©rieure et comportant des parois Ć©lectriquement isolantes permettant de continuer le dĆ©pĆ“t Ć©lectrolytique dans ledit au moins un Ć©videment aprĆØs avoir rempli ladite au moins une cavitĆ© de la couche infĆ©rieure.
According to other advantageous features of the invention:
  • the upper layer further comprises at least one recess located communicating with said at least one cavity and having electrically insulating walls for continuing the electrolytic deposition in said at least one recess after filling said at least one cavity;
  • the lower layer comprises at least one cavity revealing an electrically conductive layer portion of said substrate and having electrically insulating walls for growing an electrolytic deposit in said at least one cavity of the lower layer;
  • the lower layer further comprises at least one recess located communicating with said at least one cavity of the lower layer and having electrically insulating walls for continuing the electrolytic deposition in said at least one a recess after filling said at least one cavity of the lower layer.

Description sommaire des dessinsBrief description of the drawings

D'autres particularitĆ©s et avantages ressortiront clairement de la description qui en est faite ci-aprĆØs, Ć  titre indicatif et nullement limitatif, en rĆ©fĆ©rence aux dessins annexĆ©s, dans lesquels :

  • les figures 1 Ć  7 sont des reprĆ©sentations des Ć©tapes successives d'un procĆ©dĆ© de fabrication d'une piĆØce de micromĆ©canique selon un premier mode de rĆ©alisation de l'invention ;
  • les figures 8 Ć  12 sont des reprĆ©sentations des Ć©tapes successives d'un procĆ©dĆ© de fabrication d'une piĆØce de micromĆ©canique selon un deuxiĆØme mode de rĆ©alisation de l'invention ;
  • la figure 13 est un schĆ©ma fonctionnel d'un procĆ©dĆ© de fabrication d'une piĆØce de micromĆ©canique selon l'invention ;
  • les figures 14 Ć  19 sont des reprĆ©sentations des Ć©tapes successives d'un procĆ©dĆ© de fabrication d'une piĆØce de micromĆ©canique selon une variante de l'invention.
Other particularities and advantages will emerge clearly from the description which is given hereinafter, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the Figures 1 to 7 are representations of the successive steps of a method of manufacturing a micromechanical part according to a first embodiment of the invention;
  • the Figures 8 to 12 are representations of the successive steps of a method of manufacturing a micromechanical part according to a second embodiment of the invention;
  • the figure 13 is a block diagram of a method of manufacturing a micromechanical part according to the invention;
  • the Figures 14 to 19 are representations of the successive steps of a method of manufacturing a micromechanical component according to a variant of the invention.

Description dƩtaillƩe des modes de rƩalisation prƩfƩrƩsDetailed Description of the Preferred Embodiments

Comme visible Ć  la figure 13, l'invention se rapporte Ć  un procĆ©dĆ© de fabrication 1 d'une piĆØce de micromĆ©canique 41, 41', 41" par galvanoplastie. Le procĆ©dĆ© 1 comporte, prĆ©fĆ©rentiellement, un procĆ©dĆ© de fabrication 3 d'un moule 39, 39', 39" suivi des Ć©tapes de galvanoplastie 5 et de libĆ©ration 7 de la piĆØce 41, 41', 41" dudit moule.As visible at figure 13 The invention relates to a method of manufacturing a micromechanical part 41, 41 ', 41 "by electroplating, method 1 preferably comprises a method of manufacturing a mold 39, 39', 39 "Follow the steps of electroplating 5 and release 7 of the part 41, 41 ', 41" of said mold.

Le procƩdƩ de fabrication 3 du moule comporte des Ʃtapes successives destinƩes Ơ fabriquer un moule 39, 39', 39" comportant, prƩfƩrentiellement, des matƩriaux Ơ base de silicium.The manufacturing process 3 of the mold comprises successive steps for manufacturing a mold 39, 39 ', 39 "preferably comprising silicon-based materials.

Une premiĆØre Ć©tape 10 du procĆ©dĆ© 3 consiste Ć  se munir d'un substrat 9, 9' comportant une couche supĆ©rieure 21, 21' et une couche infĆ©rieure 23, 23', en matĆ©riaux micro-usinables Ć©lectriquement conducteurs, solidarisĆ©es entre elles par une couche intermĆ©diaire 22, 22' Ć©lectriquement isolante comme illustrĆ© aux figures 1 et 8.A first step 10 of the method 3 consists in providing a substrate 9, 9 'comprising an upper layer 21, 21' and a lower layer 23, 23 'made of electrically micro-machinable materials. conductors, secured together by an intermediate layer 22, 22 'electrically insulating as illustrated in FIGS. figures 1 and 8 .

PrĆ©fĆ©rentiellement, le substrat 9, 9' est un S.O.I. (abrĆ©viation trĆØs connue provenant des termes anglais Ā« Silicon On Isulator Ā»). De plus, les couches supĆ©rieure 21, 21' et infĆ©rieure 23, 23' sont en silicium cristallin suffisamment dopĆ© afin d'ĆŖtre Ć©lectriquement conductrices et la couche intermĆ©diaire en dioxyde de silicium.Preferably, the substrate 9, 9 'is a S.O.I. (Well known abbreviation from the English term "Silicon On Isulator"). In addition, the upper layers 21, 21 'and lower 23, 23' are sufficiently doped crystalline silicon to be electrically conductive and the intermediate layer of silicon dioxide.

Selon l'invention, le procƩdƩ 3 comporte deux modes de rƩalisation distincts Ơ partir de l'Ʃtape 11 respectivement reprƩsentƩ par un trait triple et un trait simple Ơ la figure 13.According to the invention, the method 3 comprises two distinct embodiments from the step 11 respectively represented by a triple line and a single line to the figure 13 .

Selon un premier mode de rĆ©alisation, lors de la deuxiĆØme Ć©tape 11, un masque 15 puis un masque 24 de protection sont structurĆ©s sur la couche conductrice supĆ©rieure 21 comme illustrĆ© Ć  la figure 2. Comme visible Ć©galement Ć  la figure 2, le masque 15 comporte au moins un motif 27 qui ne recouvre pas la couche supĆ©rieure 21. De plus, prĆ©fĆ©rentiellement, le masque 24, qui recouvre totalement le masque 15, comporte au moins un motif 26 qui ne recouvre pas la couche supĆ©rieure 21.According to a first embodiment, during the second step 11, a mask 15 and then a protective mask 24 are structured on the upper conductive layer 21 as illustrated in FIG. figure 2 . As visible also in the figure 2 , the mask 15 comprises at least one pattern 27 which does not cover the upper layer 21. In addition, preferably, the mask 24, which completely covers the mask 15, comprises at least one pattern 26 which does not cover the upper layer 21.

A titre d'exemple, le masque 15 peut ĆŖtre rĆ©alisĆ© par dĆ©pĆ“t d'une couche d'oxyde de silicium afin de former ledit masque jusqu'Ć  une hauteur prĆ©dĆ©terminĆ©e. Ensuite, le masque 24 peut, par exemple, ĆŖtre obtenu par photolithographie Ć  l'aide d'une rĆ©sine photosensible en recouvrement du masque 15.For example, the mask 15 may be made by depositing a silicon oxide layer to form said mask to a predetermined height. Then, the mask 24 may, for example, be obtained by photolithography using a photoresist covering the mask 15.

Selon le premier mode de rĆ©alisation visible en trait triple Ć  la figure 13, dans une troisiĆØme Ć©tape 2, la couche supĆ©rieure 21 est gravĆ©e jusqu'Ć  dĆ©couvrir la couche intermĆ©diaire 22. Selon l'invention, l'Ć©tape 2 de gravage comporte, de maniĆØre prĆ©fĆ©rĆ©e, une attaque sĆØche anisotrope du type gravage ionique rĆ©actif profond (DRIE provenant des termes anglais Ā« Deep Reactive Ion Etching Ā»).According to the first embodiment visible in triple line at the figure 13 in a third step 2, the upper layer 21 is etched until the intermediate layer 22 is discovered. According to the invention, the etching step 2 preferably comprises an anisotropic dry attack of the deep reactive ion etching type ( DRIE from the English term "Deep Reactive Ion Etching").

Dans un premier temps de l'Ć©tape 2, on effectue une attaque anisotrope dans la couche supĆ©rieure 21 selon le motif 26 du masque 24. Cette attaque permet de commencer la gravure d'au moins une cavitĆ© 25 dans la couche supĆ©rieure 21 sur une partie de son Ć©paisseur. Dans un deuxiĆØme temps, on retire le masque 24 puis on effectue une deuxiĆØme attaque anisotrope selon le motif 27 du masque 15 encore prĆ©sent sur la couche supĆ©rieure 21. La deuxiĆØme attaque permet de continuer la gravure de ladite au moins une cavitĆ© 25 mais Ć©galement de commencer la gravure d'au moins un Ć©videment 28 qui communique avec ladite au moins une cavitĆ© 25 tout en Ć©tant de plus grande section.In a first step of step 2, an anisotropic etching is carried out in the upper layer 21 according to the pattern 26 of the mask 24. This etching makes it possible to start the etching of at least one cavity 25 in the upper layer 21 on a part of its thickness. In a second step, the mask 24 is removed and then a second anisotropic etching is carried out according to the pattern 27 of the mask 15 still present on the upper layer 21. The second etching makes it possible to continue the etching of said at least one cavity 25, but also of begin etching at least one recess 28 which communicates with said at least one cavity 25 while being of larger section.

Dans une quatriĆØme Ć©tape 4, le masque 15 est retirĆ©. Ainsi, comme visible Ć  la figure 3, Ć  la fin de la quatriĆØme Ć©tape 4, la couche supĆ©rieure 21 est gravĆ©e sur toute son Ć©paisseur de ladite au moins une cavitĆ© 25 et sur une partie supĆ©rieure de son Ć©paisseur dudit au moins un Ć©videment 28.In a fourth step 4, the mask 15 is removed. So, as visible at the figure 3 at the end of the fourth step 4, the upper layer 21 is etched throughout its thickness of said at least one cavity 25 and on an upper part of its thickness of said at least one recess 28.

Dans une cinquiĆØme Ć©tape 6, un revĆŖtement 30 Ć©lectriquement isolant est dĆ©posĆ© en recouvrant l'ensemble supĆ©rieur du substrat 9 comme illustrĆ© Ć  la figure 4. PrĆ©fĆ©rentiellement, le revĆŖtement 30 est obtenu par oxydation du dessus de la couche supĆ©rieure 21 gravĆ©e et de la couche intermĆ©diaire 22.In a fifth step 6, an electrically insulating coating 30 is deposited by covering the upper assembly of the substrate 9 as illustrated in FIG. figure 4 . Preferably, the coating 30 is obtained by oxidation of the top of the etched upper layer 21 and the intermediate layer 22.

Selon une sixiĆØme Ć©tape 8, un gravage directionnel du revĆŖtement 30 et de la couche intermĆ©diaire 22 est rĆ©alisĆ©. L'Ć©tape 8 est destinĆ©e Ć  limiter la prĆ©sence de couches isolantes uniquement au niveau de chaque paroi verticale formĆ©e dans la couche supĆ©rieure 21, c'est-Ć -dire les parois 31 et 32 respectivement de ladite au moins une cavitĆ© 25 et dudit au moins un Ć©videment 28. Selon l'invention, lors d'un gravage directionnel ou anisotrope, la composante verticale du phĆ©nomĆØne de gravure est favorisĆ©e par rapport Ć  la composition horizontale, en modulant, par exemple, la pression dans la chambre (travail Ć  pression trĆØs basse), dans un rĆ©acteur RIE. Un tel gravage peut, Ć  titre d'exemple, ĆŖtre du type Ā« ion milling Ā» ou Ā« sputter etching Ā».According to a sixth step 8, a directional etching of the coating 30 and the intermediate layer 22 is performed. Step 8 is intended to limit the presence of insulating layers only at each vertical wall formed in the upper layer 21, that is to say the walls 31 and 32 respectively of said at least one cavity 25 and said least one recess 28. According to the invention, during a directional or anisotropic etching, the vertical component of the etching phenomenon is favored with respect to the horizontal composition, by modulating, for example, the pressure in the chamber (pressure work very low), in a RIE reactor. Such an engraving may, for example, be of the "ion milling" or "sputter etching" type.

En rƩalisant cette Ʃtape 8 et comme illustrƩ Ơ la figure 5, on comprend que le fond de la cavitƩ 25 dƩcouvre la couche infƩrieure 23 Ʃlectriquement conductrice et que le fond de l'Ʃvidement 28 dƩcouvre la couche supƩrieure 21 Ʃgalement conductrice.By doing this step 8 and as illustrated in figure 5 it is understood that the bottom of the cavity 25 discovers the lower layer 23 electrically conductive and the bottom of the recess 28 discovers the upper layer 21 also conductive.

Afin d'amĆ©liorer l'accrochage de la future galvanoplastie, une couche d'accrochage sur le fond de chaque cavitĆ© 25 et/ou sur le fond de chaque Ć©videment 28 peut ĆŖtre prĆ©vue. La couche d'accrochage pourrait alors consister en un mĆ©tal comme de l'alliage CrAu.In order to improve the attachment of the future electroplating, an attachment layer on the bottom of each cavity 25 and / or on the bottom of each recess 28 may be provided. The bonding layer could then consist of a metal such as CrAu alloy.

PrĆ©fĆ©rentiellement, lors de la sixiĆØme Ć©tape 8, comme illustrĆ© Ć  la figure 5, une tige 29 est montĆ©e afin de former directement le trou 42 d'axe de la piĆØce 41 de micromĆ©canique lors de l'Ć©tape 5 de galvanoplastie. Cela prĆ©sente l'avantage non seulement de ne pas Ć  avoir Ć  usiner la piĆØce 41 une fois la galvanoplastie terminĆ©e mais Ć©galement de pouvoir rĆ©aliser n'importe quelle forme de section intĆ©rieure, de maniĆØre uniforme ou non, sur toute la hauteur du trou 42. PrĆ©fĆ©rentiellement, la tige 29 est obtenue, par exemple, Ć  l'aide d'un procĆ©dĆ© de photolithographie d'une rĆ©sine photosensible.Preferably, during the sixth step 8, as illustrated in FIG. figure 5 a rod 29 is mounted to directly form the axis hole 42 of the micromechanical part 41 during electroplating step 5. This has the advantage not only of not having to machine part 41 after electroplating is completed but also to be able to make any shape of inner section, uniformly or otherwise, over the entire height of hole 42. Preferably, the rod 29 is obtained, for example, using a photolithography process of a photosensitive resin.

Dans le premier mode de rĆ©alisation, Ć  la suite de l'Ć©tape 8, le procĆ©dĆ© de fabrication 3 du moule 39 est terminĆ© et le procĆ©dĆ© de fabrication 1 de la piĆØce de micromĆ©canique se poursuit par les Ć©tapes de galvanoplastie 5 et de libĆ©ration 7 de la piĆØce 41 du moule 39.In the first embodiment, following step 8, the manufacturing process 3 of the mold 39 is finished and the manufacturing process 1 of the micromechanical part continues with the electroplating and release 7 steps of FIG. the piece 41 of the mold 39.

L'Ć©tape 5 de galvanoplastie est rĆ©alisĆ©e en connectant l'Ć©lectrode de dĆ©pĆ“t Ć  la couche infĆ©rieure 23 du moule 39 afin de faire croĆ®tre dans un premier temps un dĆ©pĆ“t Ć©lectrolytique dans la cavitĆ© 25 dudit moule puis, seulement dans un deuxiĆØme temps, dans l'Ć©videment 28 comme illustrĆ© Ć  la figure 6.The electroplating step 5 is carried out by connecting the deposition electrode to the lower layer 23 of the mold 39 so as to firstly grow an electrolytic deposit in the cavity 25 of said mold and then, only in a second step, in the 'recess 28 as illustrated in the figure 6 .

En effet, avantageusement selon l'invention, lorsque le dĆ©pĆ“t Ć©lectrolytique affleure de la partie supĆ©rieure de la cavitĆ© 25, il connecte Ć©lectriquement la couche supĆ©rieure 21 par, Ć©ventuellement, sa couche d'accrochage, ce qui permet la continuation de la croissance du dĆ©pĆ“t sur l'ensemble de l'Ć©videment 28. Avantageusement, l'invention permet la rĆ©alisation de piĆØces 41 Ć  grand Ć©lancement, c'est-Ć -dire quand la section de la cavitĆ© 25 est beaucoup plus petite que celle de l'Ć©videment 28, en Ć©vitant les problĆØmes de dĆ©collement mĆŖme avec un matĆ©riau en nickel - phosphore Ć , par exemple, 12% de phosphore.Indeed, advantageously according to the invention, when the electrolytic deposit is flush with the upper part of the cavity 25, it electrically connects the upper layer 21 by, optionally, its attachment layer, which allows the continuation of the growth of the deposit sure the assembly of the recess 28. Advantageously, the invention allows the production of parts 41 with great slenderness, that is to say when the section of the cavity 25 is much smaller than that of the recess 28, avoiding the problems of delamination even with a nickel-phosphorus material at, for example, 12% phosphorus.

En effet, grĆ¢ce Ć  l'utilisation du silicium comme couches conductrices 21, 23, et Ć©ventuellement leur couche d'accrochage, les phĆ©nomĆØnes de dĆ©lamination aux interfaces sont diminuĆ©s ce qui Ć©vite les dĆ©collements induits par les contraintes internes du matĆ©riau Ć©lectrodĆ©posĆ©.Indeed, thanks to the use of silicon as conductive layers 21, 23, and possibly their attachment layer, the delamination phenomena at the interfaces are reduced which avoids the detachments induced by the internal stresses of the electrodeposited material.

Selon le premier mode de rĆ©alisation, le procĆ©dĆ© de fabrication 1 se termine par l'Ć©tape 7, dans laquelle la piĆØce 41 formĆ©e dans la cavitĆ© 25 puis dans l'Ć©videment 28 est libĆ©rĆ©e du moule 39. L'Ć©tape 7 de libĆ©ration peut, par exemple, ĆŖtre effectuĆ©e par gravure des couches 23 et 21. Selon ce premier mode de rĆ©alisation, on comprend comme illustrĆ© Ć  la figure 7 que la piĆØce de micromĆ©canique 41 obtenue comporte deux niveaux 43, 45 de forme diffĆ©rente chacun selon une Ć©paisseur parfaitement indĆ©pendante et comportant un unique trou d'axe 42.According to the first embodiment, the manufacturing method 1 ends with step 7, in which the part 41 formed in the cavity 25 and then in the recess 28 is released from the mold 39. The release step 7 can, for example, be performed by etching layers 23 and 21. According to this first embodiment, it is understood as illustrated in FIG. figure 7 that the micromechanical part 41 obtained has two levels 43, 45 of different shape each in a perfectly independent thickness and having a single pin hole 42.

Une telle piĆØce de micromĆ©canique 41 pourrait, par exemple, ĆŖtre une roue d'Ć©chappement coaxiale ou un ensemble roue d'Ć©chappement 43 - pignon 45 comportant une prĆ©cision gĆ©omĆ©trique de l'ordre du micromĆØtre mais Ć©galement un rĆ©fĆ©rencement idĆ©al c'est-Ć -dire un positionnement parfait entre lesdits niveaux.Such a micromechanical part 41 could, for example, be a coaxial escapement wheel or an escape wheel assembly 43 - pinion 45 having a geometrical precision of the order of a micrometer but also an ideal referencing that is to say to say a perfect positioning between said levels.

Selon un deuxiĆØme mode de rĆ©alisation de l'invention, le procĆ©dĆ© 3 comporte une deuxiĆØme Ć©tape 11, consistant Ć  structurer au moins un masque 24' de protection sur la couche conductrice supĆ©rieure 21' comme illustrĆ© Ć  la figure 8. Comme visible Ć©galement Ć  la figure 8, le masque 24' comporte au moins un motif 26' qui ne recouvre pas la couche supĆ©rieure 21'. Un tel masque 24' peut, par exemple, ĆŖtre obtenu par photolithographie Ć  l'aide d'une rĆ©sine photosensible.According to a second embodiment of the invention, the method 3 comprises a second step 11, consisting of structuring at least one mask 24 'of protection on the upper conductive layer 21' as illustrated in FIG. figure 8 . As visible also in the figure 8 , the mask 24 'has at least one pattern 26' which does not cover the upper layer 21 '. Such a mask 24 'can, for example, be obtained by photolithography using a photoresist.

Dans une troisiĆØme Ć©tape 12, la couche supĆ©rieure 21' est gravĆ©e jusqu'Ć  dĆ©couvrir la couche intermĆ©diaire 22'. Selon l'invention, l'Ć©tape 12 de gravage comporte, de maniĆØre prĆ©fĆ©rĆ©e, une attaque sĆØche anisotrope du type gravage ionique rĆ©actif profond (DRIE). L'attaque anisotrope est effectuĆ©e dans la couche supĆ©rieure 21' selon le motif 26' du masque 24'.In a third step 12, the upper layer 21 'is etched until discovering the intermediate layer 22'. According to the invention, the etching step 12 preferably comprises an anisotropic dry etching of the deep reactive ion etching (DRIE) type. The anisotropic etching is performed in the upper layer 21 'according to the pattern 26' of the mask 24 '.

Dans une quatriĆØme Ć©tape 14, le masque 24' est retirĆ©. Ainsi, comme visible Ć  la figure 9, Ć  la fin de la quatriĆØme Ć©tape 14, la couche supĆ©rieure 21' est gravĆ©e sur toute son Ć©paisseur d'au moins une cavitĆ© 25'.In a fourth step 14, the mask 24 'is removed. So, as visible at the figure 9 at the end of the fourth step 14, the upper layer 21 'is etched throughout its thickness of at least one cavity 25'.

Dans une cinquiĆØme Ć©tape 16, un revĆŖtement 30' Ć©lectriquement isolant est dĆ©posĆ© en recouvrant l'ensemble supĆ©rieur du substrat 9' comme illustrĆ© Ć  la figure 10. PrĆ©fĆ©rentiellement, le revĆŖtement 30' est obtenu par oxydation du dessus de la couche supĆ©rieure 21' gravĆ©e et de la couche intermĆ©diaire 22'.In a fifth step 16, an electrically insulating coating 30 'is deposited by covering the upper assembly of the substrate 9' as illustrated in FIG. figure 10 . Preferably, the coating 30 'is obtained by oxidation of the top of the upper layer 21' etched and the intermediate layer 22 '.

Selon une sixiĆØme Ć©tape 18, un gravage directionnel du revĆŖtement 30' et de la couche intermĆ©diaire 22' est rĆ©alisĆ©. L'Ć©tape 18 est destinĆ©e Ć  limiter la prĆ©sence de couches isolantes uniquement au niveau de chaque paroi verticale formĆ©e dans la couche supĆ©rieure 21', c'est-Ć -dire les parois 31' de ladite au moins une cavitĆ© 25'. En rĆ©alisant cette Ć©tape 18 et comme illustrĆ© Ć  la figure 11, on comprend que le fond de la cavitĆ© 25' dĆ©couvre la couche infĆ©rieure 23' Ć©lectriquement conductrice et le dessus de la couche supĆ©rieure 21' Ć©galement conductrice.According to a sixth step 18, a directional etching of the coating 30 'and the intermediate layer 22' is carried out. Step 18 is intended to limit the presence of insulating layers only at each vertical wall formed in the upper layer 21 ', that is to say the walls 31' of said at least one cavity 25 '. By doing this step 18 and as illustrated in figure 11 it is understood that the bottom of the cavity 25 'discovers the lower layer 23' electrically conductive and the top of the upper layer 21 'also conductive.

Comme dans le premier mode de rĆ©alisation, afin d'amĆ©liorer l'accrochage de la future galvanoplastie, une couche d'accrochage sur le fond de chaque cavitĆ© 25' et/ou sur le dessus de la couche supĆ©rieure 21' peut ĆŖtre prĆ©vue. La couche d'accrochage pourrait alors consister en un mĆ©tal comme de l'alliage CrAu.As in the first embodiment, in order to improve the adhesion of the future electroplating, an attachment layer on the bottom of each cavity 25 'and / or on the top of the upper layer 21' may be provided. The bonding layer could then consist of a metal such as CrAu alloy.

Lors de la sixiĆØme Ć©tape 18, comme expliquĆ© pour le premier mode de rĆ©alisation des figures 1 Ć  7, une tige peut ĆŖtre montĆ©e afin de former directement le trou d'axe de la piĆØce de micromĆ©canique lors de l'Ć©tape 5 de galvanoplastie avec les mĆŖmes avantages que citĆ©s prĆ©cĆ©demment.In the sixth step 18, as explained for the first embodiment of the Figures 1 to 7 , a rod can be mounted to form directly the axis hole of the micromechanical part during electroplating step 5 with the same advantages as mentioned above.

Dans le deuxiĆØme mode de rĆ©alisation, Ć  la suite de l'Ć©tape 18, le procĆ©dĆ© de fabrication 3 du moule 39' est terminĆ© et le procĆ©dĆ© de fabrication 1 de la piĆØce de micromĆ©canique se poursuit par les Ć©tapes de galvanoplastie 5 et de libĆ©ration 7 de la piĆØce du moule 39'.In the second embodiment, following step 18, the manufacturing method 3 of the mold 39 'is finished and the manufacturing process 1 of the micromechanical part continues with the electroplating and release steps 7 of the mold part 39 '.

L'Ʃtape 5 de galvanoplastie est rƩalisƩe en connectant l'Ʃlectrode de dƩpƓt Ơ la couche infƩrieure 23' du moule 39' afin de faire croƮtre un dƩpƓt Ʃlectrolytique dans la cavitƩ 25' du moule 39'.Step 5 of electroplating is performed by connecting the deposition electrode to the lower layer 23 'of the mold 39' in order to grow an electrolytic deposit in the cavity 25 'of the mold 39'.

Selon le deuxiĆØme mode de rĆ©alisation, le procĆ©dĆ© de fabrication 1 se termine par l'Ć©tape 7 similaire Ć  celle expliquĆ©e dans le premier mode de rĆ©alisation, dans laquelle la piĆØce formĆ©e dans la cavitĆ© 25' est libĆ©rĆ©e du moule 39'. Selon ce deuxiĆØme mode de rĆ©alisation, on comprend que la piĆØce de micromĆ©canique obtenue comporte un seul niveau de forme identique selon toute son Ć©paisseur et pouvant comporter un trou d'axe.According to the second embodiment, the manufacturing method 1 ends with the step 7 similar to that explained in the first embodiment, in which the piece formed in the cavity 25 'is released from the mold 39'. According to this second embodiment, it is understood that the micromechanical part obtained has a single level of identical shape over its entire thickness and may include an axis hole.

Une telle piĆØce de micromĆ©canique pourrait, par exemple, ĆŖtre une roue d'Ć©chappement ou une ancre d'Ć©chappement ou mĆŖme un pignon comportant une prĆ©cision gĆ©omĆ©trique de l'ordre du micromĆØtre.Such a micromechanical part could, for example, be an escape wheel or an escapement anchor or even a pinion having a geometric precision of the order of a micrometer.

Selon une alternative Ć  ce deuxiĆØme mode de rĆ©alisation illustrĆ© par un trait double Ć  la figure 13, Ć  la suite de l'Ć©tape 18, le procĆ©dĆ© de fabrication 3 du moule 39' comporte une Ć©tape supplĆ©mentaire 20 destinĆ©e Ć  former au moins un deuxiĆØme niveau au moule 39' comme illustrĆ© Ć  la figure 12. Ainsi, le deuxiĆØme niveau est rĆ©alisĆ© en montant une piĆØce 27', comportant des parois 32' Ć©lectriquement isolantes, sur la couche supĆ©rieure 21' qui n'a pas Ć©tĆ© retirĆ©e lors de l'Ć©tape 12.According to an alternative to this second embodiment illustrated by a double line to the figure 13 following step 18, the manufacturing method 3 of the mold 39 'has a further step 20 for forming at least a second level of the mold 39' as illustrated in FIG. figure 12 . Thus, the second level is achieved by mounting a piece 27 ', having walls 32' electrically insulating, on the upper layer 21 'which has not been removed in step 12.

PrĆ©fĆ©rentiellement, la piĆØce 27' ajoutĆ©e forme au moins un Ć©videment 28' de section plus grande que les parties retirĆ©es 25', par exemple, Ć  l'aide d'un procĆ©dĆ© de photolithographie d'une rĆ©sine photosensible. Cependant, la piĆØce 27' pourrait Ć©galement comporter un matĆ©riau Ć  base de silicium isolant prĆ©alablement gravĆ© puis ĆŖtre solidarisĆ©e sur la couche conductrice 21'.Preferably, the added piece 27 'forms at least one recess 28' of larger section than the removed portions 25 ', for example, using a photolithography process of a photoresist. However, Exhibit 27 'could also include a insulating silicon material previously etched and then secured to the conductive layer 21 '.

Par consĆ©quent, selon l'alternative du deuxiĆØme mode de rĆ©alisation, Ć  la suite de l'Ć©tape 20, le procĆ©dĆ© de fabrication 3 du moule 39' est terminĆ© et le procĆ©dĆ© de fabrication 1 de la piĆØce de micromĆ©canique se poursuit par les Ć©tapes de galvanoplastie 5 et de libĆ©ration 7 de la piĆØce 41' du moule 39'.Therefore, according to the alternative of the second embodiment, following step 20, the manufacturing method 3 of the mold 39 'is completed and the manufacturing process 1 of the micromechanical part continues with the steps of electroplating 5 and release 7 of the piece 41 'of the mold 39'.

L'Ć©tape 5 de galvanoplastie est rĆ©alisĆ©e en connectant l'Ć©lectrode de dĆ©pĆ“t Ć  la couche infĆ©rieure 23' du moule 39' afin de faire croĆ®tre dans un premier temps un dĆ©pĆ“t Ć©lectrolytique dans la cavitĆ© 25' dudit moule puis, seulement dans un deuxiĆØme temps, dans l'Ć©videment 28' comme illustrĆ© Ć  la figure 12.The electroplating step 5 is carried out by connecting the deposition electrode to the lower layer 23 'of the mold 39' so as to initially grow an electrolytic deposit in the cavity 25 'of said mold, and then only in a second step in the recess 28 'as illustrated in FIG. figure 12 .

En effet, avantageusement selon l'invention, lorsque le dĆ©pĆ“t Ć©lectrolytique affleure de la partie supĆ©rieure de la cavitĆ© 25', il connecte Ć©lectriquement la couche supĆ©rieure 21' par, Ć©ventuellement, sa couche d'accrochage, ce qui permet la continuation de la croissance du dĆ©pĆ“t sur l'ensemble de l'Ć©videment 28'. Avantageusement, l'invention permet la rĆ©alisation de piĆØces 41' Ć  grand Ć©lancement, c'est-Ć -dire quand la section de la cavitĆ© 25' est beaucoup plus petite que celle de l'Ć©videment 28', en Ć©vitant les problĆØmes de dĆ©collement mĆŖme avec un matĆ©riau en nickel - phosphore Ć , par exemple, 12% de phosphore.Indeed, advantageously according to the invention, when the electrolytic deposit is flush with the upper part of the cavity 25 ', it electrically connects the top layer 21' with, optionally, its attachment layer, which allows the continuation of the growth. depositing on the entire recess 28 '. Advantageously, the invention allows the production of parts 41 'with great slenderness, that is to say when the section of the cavity 25' is much smaller than that of the recess 28 ', avoiding the problems of delamination even with a nickel-phosphorus material at, for example, 12% phosphorus.

En effet, grĆ¢ce Ć  l'utilisation du silicium comme couches conductrices 21', 23', et Ć©ventuellement leur couche d'accrochage les phĆ©nomĆØnes de dĆ©lamination aux interfaces sont diminuĆ©s ce qui Ć©vite les dĆ©collements induits par les contraintes internes du matĆ©riau Ć©lectrodĆ©posĆ©.Indeed, thanks to the use of silicon as conductive layers 21 ', 23', and possibly their attachment layer the delamination phenomena at the interfaces are reduced which avoids the detachments induced by the internal stresses of the electrodeposited material.

Selon l'alternative du deuxiĆØme mode de rĆ©alisation, le procĆ©dĆ© de fabrication 1 se termine par l'Ć©tape 7 similaire Ć  celle expliquĆ©e dans le premier mode de rĆ©alisation, dans laquelle la piĆØce 41' formĆ©e dans le moule 39' est libĆ©rĆ©e. On comprend comme illustrĆ© Ć  la figure 12 que la piĆØce de micromĆ©canique 41' obtenue comporte deux niveaux de forme diffĆ©rente chacun selon une Ć©paisseur parfaitement indĆ©pendante et pouvant comporter un unique trou d'axe. Une telle piĆØce de micromĆ©canique 41' peut par consĆ©quent avoir la mĆŖme forme que celle 41 obtenue grĆ¢ce au premier mode de rĆ©alisation et ainsi comporter une prĆ©cision gĆ©omĆ©trique de l'ordre du micromĆØtre mais Ć©galement un rĆ©fĆ©rencement idĆ©al c'est-Ć -dire un positionnement parfait entre lesdits niveaux.According to the alternative of the second embodiment, the manufacturing method 1 ends in step 7 similar to that explained in the first embodiment, in which the piece 41 'formed in the mold 39' is released. We understand as illustrated at figure 12 that the micromechanical part 41 'obtained has two levels of shape each different to a perfectly independent thickness and may include a single pinhole. Such a micromechanical part 41 'can consequently have the same shape as that obtained by the first embodiment and thus include a geometrical precision of the order of a micrometer but also an ideal referencing, that is to say a positioning perfect between said levels.

Selon une variante (illustrĆ©e en traits doubles discontinus Ć  la figure 13) aux deux modes de rĆ©alisation du procĆ©dĆ© 1 visible aux figures 14 Ć  19, il est possible d'appliquer le procĆ©dĆ© 3 Ć©galement Ć  la couche infĆ©rieure 23, 23' afin de rajouter un ou deux autres niveaux au moule 39, 39'. Afin de ne pas surcharger les figures, un seul exemple est dĆ©taillĆ© ci-dessus mais on comprend que la couche infĆ©rieure 23, 23' peut Ć©galement ĆŖtre transformĆ©e selon le premier mode de rĆ©alisation ou le deuxiĆØme mode de rĆ©alisation avec son alternative ou non expliquĆ©s ci-dessus.According to a variant (illustrated in double dashed lines at the figure 13 ) to the two embodiments of method 1 visible to Figures 14 to 19 it is possible to apply the method 3 also to the lower layer 23, 23 'in order to add one or two other levels to the mold 39, 39'. In order not to overload the figures, a single example is detailed above but it is understood that the lower layer 23, 23 'can also be converted according to the first embodiment or the second embodiment with its alternative or not explained here. -above.

La variante reste identique au procƩdƩ 1 dƩcrit ci-dessus jusqu'Ơ l'Ʃtape 8, 18 ou 20 suivant le mode de rƩalisation utilisƩ. Dans l'exemple illustrƩ aux figures 14 Ơ 19, on prendra comme point de dƩpart du procƩdƩ 1, l'exemple du premier mode de rƩalisation comme illustrƩ Ơ la figure 13 en trait triple.The variant remains identical to method 1 described above until step 8, 18 or 20 according to the embodiment used. In the example shown in Figures 14 to 19 the starting point of method 1 will be the example of the first embodiment as illustrated in FIG. figure 13 in triple line.

PrĆ©fĆ©rentiellement selon cette variante, la couche infĆ©rieure 23 est destinĆ©e Ć  ĆŖtre gravĆ©e afin de former au moins une deuxiĆØme cavitĆ© 35 dans le moule 39". Comme visible, de maniĆØre prĆ©fĆ©rĆ©e entre la figure 5 et la figure 14, un dĆ©pĆ“t 33 a Ć©tĆ© rĆ©alisĆ© dans une partie de la premiĆØre cavitĆ© 25 afin de fournir une couche de dĆ©part de galvanoplastie. PrĆ©fĆ©rentiellement, ce dĆ©pĆ“t 33 est effectuĆ© en commenƧant l'Ć©tape 5 jusqu'Ć  une Ć©paisseur prĆ©dĆ©terminĆ©e. Cependant, ce dĆ©pĆ“t peut ĆŖtre effectuĆ© selon un autre procĆ©dĆ©.Preferably according to this variant, the lower layer 23 is intended to be etched in order to form at least one second cavity 35 in the mold 39 ". figure 5 and the figure 14 , a deposit 33 has been made in a portion of the first cavity 25 to provide an electroplating starting layer. Preferably, this deposit 33 is carried out starting from step 5 to a predetermined thickness. However, this deposit can be carried out according to another method.

Comme illustrĆ© par des traits double discontinus Ć  la figure 13 et les figures 14 Ć  19, la variante du procĆ©dĆ© 1 applique Ć  la couche infĆ©rieure 23, les Ć©tapes 11, 12, 14, 16 et 18 du deuxiĆØme mode de rĆ©alisation du procĆ©dĆ© 3.As illustrated by double dashed lines at the figure 13 and the Figures 14 to 19 , variant of method 1 applies to the lower layer 23, steps 11, 12, 14, 16 and 18 of the second embodiment of method 3.

Ainsi selon la variante, le procĆ©dĆ© 3 comporte une nouvelle Ć©tape 11, consistant Ć  structurer au moins un masque 34 sur la couche conductrice infĆ©rieure 23 comme illustrĆ© Ć  la figure 15. Comme visible Ć©galement Ć  la figure 15, le masque 34 comporte au moins un motif 36 qui ne recouvre pas la couche infĆ©rieure 23. Un tel masque 34 peut, par exemple, ĆŖtre obtenu par photolithographie Ć  l'aide d'une rĆ©sine photosensible.Thus according to the variant, the method 3 comprises a new step 11, consisting of structuring at least one mask 34 on the lower conductive layer 23 as illustrated in FIG. figure 15 . As visible also in the figure 15 the mask 34 comprises at least one pattern 36 which does not cover the lower layer 23. Such a mask 34 may, for example, be obtained by photolithography using a photoresist.

Ensuite, Ơ la nouvelle Ʃtape 12, la couche 23 est gravƩe selon le motif 36 jusqu'Ơ dƩcouvrir le dƩpƓt 33 Ʃlectriquement conducteur. Puis le masque de protection 34 est retirƩ lors d'une nouvelle Ʃtape 14. Ainsi, comme visible Ơ la figure 16, Ơ la fin de l'Ʃtape 14, la couche infƩrieure 23 est gravƩe sur toute son Ʃpaisseur d'au moins une cavitƩ 35.Then, in the new step 12, the layer 23 is etched according to the pattern 36 until the electrically conductive deposit 33 is discovered. Then the protective mask 34 is removed in a new step 14. Thus, as visible in FIG. figure 16 at the end of step 14, the bottom layer 23 is etched over its entire thickness with at least one cavity 35.

Dans une nouvelle Ć©tape 16, un revĆŖtement 38 Ć©lectriquement isolant est dĆ©posĆ© en recouvrant l'ensemble infĆ©rieur du substrat 9" comme illustrĆ© Ć  la figure 17. PrĆ©fĆ©rentiellement, le revĆŖtement 38 est obtenu par dĆ©pĆ“t d'un oxyde de silicium sur le dessus de la couche infĆ©rieure 23, par exemple, Ć  l'aide d'un dĆ©pĆ“t physique en phase vapeur.In a new step 16, an electrically insulating coating 38 is deposited by covering the bottom assembly of the substrate 9 "as shown in FIG. figure 17 . Preferably, the coating 38 is obtained by depositing a silicon oxide on the top of the lower layer 23, for example, using a physical vapor deposition.

PrĆ©fĆ©rentiellement une nouvelle Ć©tape 18 n'est pas nĆ©cessaire si un seul niveau est ajoutĆ© au moule 39". Sinon, un gravage directionnel du revĆŖtement 38 est rĆ©alisĆ©. La nouvelle Ć©tape 18 serait destinĆ©e Ć  limiter la prĆ©sence de couche isolante uniquement au niveau de chaque paroi verticale 39 formĆ©e dans la couche infĆ©rieure 23, c'est-Ć -dire les parois de ladite au moins une cavitĆ© 35. Dans notre exemple des figures 14 Ć  19, une nouvelle Ć©tape 18 n'est effectuĆ©e que pour enlever la couche d'oxyde prĆ©sente dans le fond de ladite au moins une cavitĆ© 35.Preferably, a new step 18 is not necessary if only one level is added to the mold 39. Otherwise, a directional etching of the coating 38 is performed The new step 18 would be intended to limit the presence of insulating layer only at the level of each vertical wall 39 formed in the lower layer 23, that is to say the walls of said at least one cavity 35. In our example of Figures 14 to 19 a new step 18 is performed only to remove the oxide layer present in the bottom of the at least one cavity 35.

Lors de la nouvelle Ć©tape 18, comme expliquĆ© prĆ©cĆ©demment, une tige 37 peut ĆŖtre montĆ©e afin de former directement le trou 42" d'axe de la piĆØce de micromĆ©canique 41" lors de l'Ć©tape 5 de galvanoplastie avec les mĆŖmes avantages que citĆ©s prĆ©cĆ©demment.In the new step 18, as explained above, a rod 37 can be mounted to directly form the hole 42 "axis of the micromechanical part 41" during the electroplating step 5 with the same advantages as mentioned above. .

Dans la variante du procĆ©dĆ© 1, Ć  la suite de l'Ć©tape 18, le procĆ©dĆ© de fabrication 3 du moule 39" est terminĆ© et le procĆ©dĆ© de fabrication 1 de la piĆØce de micromĆ©canique se poursuit par les Ć©tapes de galvanoplastie 5 et de libĆ©ration 7 de la piĆØce 41" du moule 39". PrĆ©fĆ©rentiellement, si les tiges 29 et 37 sont formĆ©es respectivement dans les cavitĆ©s 25 et 35, elles sont alignĆ©es. PrĆ©fĆ©rentiellement, la tige 37 est obtenue, par exemple, Ć  l'aide d'un procĆ©dĆ© de photolithographie d'une rĆ©sine photosensible.In the variant of method 1, following step 18, the manufacturing method 3 of the mold 39 "is finished and the manufacturing process 1 of the micromechanical part continues with the electroplating and release steps 7 preferably, if the rods 29 and 37 are respectively formed in the cavities 25 and 35, they are preferably aligned, preferably the rod 37 is obtained, for example, using a photolithography process of a photosensitive resin.

A la suite des nouvelles Ć©tapes 8, 18 ou 20, l'Ć©tape 5 de galvanoplastie est rĆ©alisĆ©e en connectant l'Ć©lectrode de dĆ©pĆ“t Ć  la couche infĆ©rieure 23 afin de faire croĆ®tre un dĆ©pĆ“t Ć©lectrolytique dans la cavitĆ© 35 mais Ć©galement continuer la croissance du dĆ©pĆ“t dans la cavitĆ© 25, puis, seulement dans un deuxiĆØme temps, dans l'Ć©videment 28 comme illustrĆ© Ć  la figure 18. Le procĆ©dĆ© de fabrication 1 se termine par l'Ć©tape 7, dans laquelle la piĆØce 41" est libĆ©rĆ©e du moule 39" comme expliquĆ© ci-dessus.Following the new steps 8, 18 or 20, the electroplating step 5 is performed by connecting the deposition electrode to the lower layer 23 in order to grow an electrolytic deposit in the cavity 35 and also to continue the growth of the deposit in the cavity 25, then, only in a second step, in the recess 28 as illustrated in FIG. figure 18 . The manufacturing method 1 ends with step 7, in which the part 41 "is released from the mold 39" as explained above.

Selon cette variante, on comprend comme illustrĆ© Ć  la figure 19 que la piĆØce de micromĆ©canique 41" obtenue comporte au moins trois niveaux 43", 45" et 47" de forme diffĆ©rente chacun selon une Ć©paisseur parfaitement indĆ©pendante avec un trou d'axe unique 42".According to this variant, it is understood as illustrated in FIG. figure 19 that the micromechanical part 41 "obtained has at least three levels 43", 45 "and 47" of different shape each in a perfectly independent thickness with a single axis hole 42 ".

Une telle piĆØce de micromĆ©canique pourrait, par exemple, ĆŖtre une roue d'Ć©chappement coaxiale 43", 45" avec son pignon 47" ou un mobile Ć  trois niveaux de dentures 43", 45", 47" comportant une prĆ©cision gĆ©omĆ©trique de l'ordre du micromĆØtre mais Ć©galement un rĆ©fĆ©rencement idĆ©al c'est-Ć -dire un positionnement parfait entre lesdits niveaux.Such a micromechanical part could, for example, be a coaxial escape wheel 43 ", 45" with its pinion 47 "or a mobile with three levels of teeth 43", 45 ", 47" having a geometric precision of the micrometer order but also an ideal referencing that is to say a perfect positioning between said levels.

Bien entendu, la prĆ©sente invention ne se limite pas Ć  l'exemple illustrĆ© mais est susceptible de diverses variantes et modifications qui apparaĆ®tront Ć  l'homme de l'art. Ainsi, plusieurs moules 39, 39', 39" sont fabriquĆ©s sur le mĆŖme substrat 9, 9', 9" afin de rĆ©aliser une production en sĆ©rie de piĆØces de micromĆ©canique 41, 41', 41" qui ne sont pas forcĆ©ment identiques entre elles. De mĆŖme, on peut Ć©galement envisager changer des matĆ©riaux Ć  base de silicium par de l'alumine cristallisĆ©e ou de la silice cristallisĆ©e ou carbure de silicium.Of course, the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art. Thus, several molds 39, 39 ', 39 "are manufactured on the same substrate 9, 9', 9" in order to produce a series production of micromechanical parts 41, 41 ', 41 "which are not necessarily identical to each other. Likewise, it is also conceivable to change silicon-based materials by crystalline alumina or crystallized silica or silicon carbide.

Claims (18)

ProcĆ©dĆ© de fabrication (3) d'un moule (39, 39', 39") comportant les Ć©tapes suivantes : a) se munir (10) d'un substrat (9, 9') comportant une couche supĆ©rieure (21, 21') et une couche infĆ©rieure (23, 23') en matĆ©riau Ć  base de silicium Ć©lectriquement conducteur et solidarisĆ©es entre elles par une couche intermĆ©diaire (22, 22') Ć©lectriquement isolante ; b) graver (11, 12, 14, 2, 4) au moins un motif (26, 26', 27) dans la couche supĆ©rieure (21, 21') jusqu'Ć  la couche intermĆ©diaire (22, 22') afin de former au moins une cavitĆ© (25, 25') dudit moule ; c) recouvrir (6, 16) la partie supĆ©rieure dudit substrat d'un revĆŖtement (30, 30') Ć©lectriquement isolant ; d) graver (8, 18) de maniĆØre directionnelle ledit revĆŖtement et ladite couche intermĆ©diaire afin de limiter leur prĆ©sence uniquement au niveau de chaque paroi verticale (31, 31', 33) formĆ©e dans ladite couche supĆ©rieure. A method of manufacturing (3) a mold (39, 39 ', 39 ") comprising the steps of: a) providing (10) a substrate (9, 9 ') comprising an upper layer (21, 21') and a lower layer (23, 23 ') of electrically conductive silicon-based material secured together by an electrically insulating intermediate layer (22, 22 '); b) etching (11, 12, 14, 2, 4) at least one pattern (26, 26 ', 27) in the upper layer (21, 21') to the intermediate layer (22, 22 ') in order to forming at least one cavity (25, 25 ') of said mold; c) covering (6, 16) the upper portion of said substrate with an electrically insulating coating (30, 30 '); d) etching (8, 18) directionally said coating and said intermediate layer to limit their presence only at each vertical wall (31, 31 ', 33) formed in said top layer. ProcĆ©dĆ© (3) selon la revendication 1, caractĆ©risĆ© en ce qu'un deuxiĆØme motif (27) est gravĆ© lors de l'Ć©tape b) afin de former au moins un Ć©videment (28) communiquant avec ladite au moins une cavitĆ© offrant Ć  ladite couche supĆ©rieure un deuxiĆØme niveau.Method (3) according to claim 1, characterized in that a second pattern (27) is etched in step b) to form at least one recess (28) communicating with said at least one cavity providing said layer superior a second level. ProcĆ©dĆ© (3) selon la revendication 1, caractĆ©risĆ© en ce qu'une piĆØce (27') est montĆ©e aprĆØs l'Ć©tape d) afin de former au moins un Ć©videment (28') communiquant avec ladite au moins une cavitĆ© offrant audit moule un deuxiĆØme niveau.Method (3) according to claim 1, characterized in that a piece (27 ') is mounted after step d) to form at least one recess (28') communicating with said at least one cavity providing said mold with a second level. ProcĆ©dĆ© (3) selon l'une des revendications prĆ©cĆ©dentes, caractĆ©risĆ© en ce qu'il comporte l'Ć©tape finale suivante : e) former (8, 18) une tige (29, 29') par photolithographie dans ladite au moins une cavitĆ© afin de former un trou (42, 42') dans la future piĆØce (41, 41') rĆ©alisĆ©e dans ledit moule. Method (3) according to one of the preceding claims, characterized in that it comprises the following final step: e) forming (8, 18) a rod (29, 29 ') by photolithography in said at least one cavity to form a hole (42, 42') in the future piece (41, 41 ') made in said mold. ProcĆ©dĆ© (3) selon l'une des revendications prĆ©cĆ©dentes,
caractĆ©risĆ© en ce qu'il comporte, Ć  la suite des Ć©tapes prĆ©cĆ©dentes, les Ć©tapes suivantes : a')dĆ©poser un matĆ©riau Ć©lectriquement conducteur dans le fond de ladite au moins une cavitĆ© ; b') graver (11, 12, 14, 2, 4) un motif (26, 26', 27) dans la couche infĆ©rieure (23, 23') jusqu'au dĆ©pĆ“t (33) dudit matĆ©riau conducteur afin de former au moins une cavitĆ© (35) dudit moule ; c') recouvrir (6, 16) l'ensemble d'un deuxiĆØme revĆŖtement (38) Ć©lectriquement isolant. Method (3) according to one of the preceding claims,
characterized in that it comprises, following the preceding steps, the following steps: a ') depositing an electrically conductive material in the bottom of said at least one cavity; b ') etching (11, 12, 14, 2, 4) a pattern (26, 26', 27) in the lower layer (23, 23 ') until the deposit (33) of said conductive material to form at least one cavity (35) of said mold; c ') covering (6, 16) the assembly of a second coating (38) electrically insulating. ProcĆ©dĆ© (3) selon la revendication 5, caractĆ©risĆ© en ce qu'il comporte, Ć  la suite de l'Ć©tape c'), l'Ć©tape suivante : d')graver (8, 18) de maniĆØre directionnelle ledit deuxiĆØme revĆŖtement afin de limiter sa prĆ©sence uniquement au niveau de chaque paroi (39) verticale formĆ©e dans ladite couche infĆ©rieure. Method (3) according to claim 5, characterized in that it comprises, following step c '), the following step: d) etching (8, 18) directionally said second coating to limit its presence only at each vertical wall (39) formed in said bottom layer. ProcĆ©dĆ© (3) selon la revendication 6, caractĆ©risĆ© en ce qu'un deuxiĆØme motif est gravĆ© lors de l'Ć©tape b') afin de former au moins un Ć©videment communiquant avec ladite au moins une cavitĆ© offrant Ć  ladite couche infĆ©rieure un deuxiĆØme niveau.Method (3) according to claim 6, characterized in that a second pattern is etched in step b ') to form at least one recess communicating with said at least one cavity providing said lower layer a second level. ProcĆ©dĆ© (3) selon la revendication 6, caractĆ©risĆ© en ce qu'une piĆØce est montĆ©e aprĆØs l'Ć©tape d') afin de former au moins un Ć©videment communiquant avec ladite au moins une cavitĆ© offrant audit moule un deuxiĆØme niveau.Method (3) according to claim 6, characterized in that a part is mounted after step d ') to form at least one recess communicating with said at least one cavity providing said mold a second level. ProcĆ©dĆ© (3) selon l'une des revendications 5 Ć  8, caractĆ©risĆ© en ce qu'il comporte l'Ć©tape finale suivante : e')former une tige (37) par photolithographie dans ladite au moins une cavitĆ© de la couche infĆ©rieure (23, 23') afin de former un trou (42") dans la future piĆØce (41 ") rĆ©alisĆ©e dans ledit moule. Process (3) according to one of Claims 5 to 8, characterized in that it comprises the following final step: e ') forming a rod (37) by photolithography in said at least one cavity of the lower layer (23, 23') to form a hole (42 ") in the future piece (41") made in said mold. ProcĆ©dĆ© (3) selon l'une des revendications prĆ©cĆ©dentes,
caractĆ©risĆ© en ce que plusieurs moules (39, 39', 39") sont fabriquĆ©s sur le mĆŖme substrat (9, 9', 9").Method (3) according to one of the preceding claims,
characterized in that a plurality of molds (39, 39 ', 39 ") are manufactured on the same substrate (9, 9', 9"). ProcƩdƩ (3) selon l'une des revendications prƩcƩdentes,
caractƩrisƩ en ce que les couches conductrices (21, 21', 23, 23') sont formƩes par du silicium cristallin dopƩ.Method (3) according to one of the preceding claims,
characterized in that the conductive layers (21, 21 ', 23, 23') are formed by doped crystalline silicon. ProcƩdƩ (3) selon l'une des revendications prƩcƩdentes,
caractƩrisƩ en ce que l'Ʃtape c) est obtenue par oxydation de la partie supƩrieure dudit substrat.Method (3) according to one of the preceding claims,
characterized in that step c) is obtained by oxidation of the upper portion of said substrate. ProcĆ©dĆ© (3) selon la revendication prĆ©cĆ©dente, caractĆ©risĆ© en ce que le revĆŖtement (30, 30') Ć©lectriquement isolant est formĆ© par du dioxyde de silicium.Method (3) according to the preceding claim, characterized in that the electrically insulating coating (30, 30 ') is formed by silicon dioxide. ProcĆ©dĆ© de fabrication (1) par galvanoplastie d'une piĆØce de micromĆ©canique (41, 41', 41"), caractĆ©risĆ© en ce qu'il comprend les Ć©tapes suivantes : i) fabriquer un moule (39, 39', 39") selon le procĆ©dĆ© (3) conforme Ć  l'une des revendications prĆ©cĆ©dentes ; j) rĆ©aliser (5) une Ć©lectrodĆ©position en connectant l'Ć©lectrode Ć  la couche conductrice infĆ©rieure (23, 23') du substrat (9, 9', 9") afin de former ladite piĆØce dans ledit moule ; k) libĆ©rer la piĆØce (41, 41', 41 ") dudit moule. Method of manufacturing (1) by electroplating a micromechanical component (41, 41 ', 41 "), characterized in that it comprises the following steps: i) manufacturing a mold (39, 39 ', 39 ") according to the method (3) according to one of the preceding claims; j) performing (5) electroplating by connecting the electrode to the lower conductive layer (23, 23 ') of the substrate (9, 9', 9 ") to form said part in said mold; k) releasing the piece (41, 41 ', 41 ") of said mold. Moule (39, 39', 39") destinĆ© Ć  fabriquer une piĆØce de micromĆ©canique (41, 41', 41") par galvanoplastie, caractĆ©risĆ© en ce qu'il comporte un substrat (9, 9', 9") comportant une couche supĆ©rieure (21, 21') et une couche infĆ©rieure (23, 23') en silicium cristallin dopĆ© Ć©lectriquement conductrices et solidarisĆ©es entre elles par une couche intermĆ©diaire (22, 22') Ć©lectriquement isolante, la couche supĆ©rieure (21, 21') comportant au moins une cavitĆ© (25, 25') dĆ©couvrant une partie de la couche infĆ©rieure (23, 23') dudit substrat et comportant des parois (31, 31') en dioxyde de silicium Ć©lectriquement isolantes permettant de faire croĆ®tre un dĆ©pĆ“t Ć©lectrolytique dans ladite au moins une cavitĆ©.Mold (39, 39 ', 39 ") for manufacturing a micromechanical part (41, 41', 41") by electroplating, characterized in that it comprises a substrate (9, 9 ', 9 ") having a layer an upper layer (21, 21 ') and a lower layer (23, 23') of crystalline silicon doped electrically conductive and secured to each other by an electrically insulating intermediate layer (22, 22 '), the upper layer (21, 21') comprising at least one cavity (25, 25 ') revealing a portion of the lower layer (23, 23') of said substrate and having walls (31, 31 ') of electrically insulating silicon for growing an electrolytic deposit in said at least one cavity. Moule (39, 39', 39") selon la revendication 15, caractĆ©risĆ© en ce que la couche supĆ©rieure (21, 21') comporte en outre au moins un Ć©videment (28, 28') situĆ© communiquant avec ladite au moins une cavitĆ© et comportant des parois (32, 32') Ć©lectriquement isolantes permettant de continuer le dĆ©pĆ“t Ć©lectrolytique dans ledit au moins un Ć©videment aprĆØs avoir rempli ladite au moins une cavitĆ©.Mold (39, 39 ', 39 ") according to claim 15, characterized in that the upper layer (21, 21') further comprises at least one recess (28, 28 ') located communicating with said at least one cavity and having electrically insulating walls (32, 32 ') for continuing electrolytic deposition in said at least one recess after filling said at least one cavity. Moule (39") selon la revendication 15 ou 16, caractĆ©risĆ© en ce que la couche infĆ©rieure (23, 23') comporte au moins une cavitĆ© (35) dĆ©couvrant une partie de couche (33) Ć©lectriquement conductrice dudit substrat et comportant des parois (40) en dioxyde de silicium Ć©lectriquement isolantes permettant de faire croĆ®tre un dĆ©pĆ“t Ć©lectrolytique dans ladite au moins une cavitĆ© de la couche infĆ©rieure (23, 23').Mold (39 ") according to claim 15 or 16, characterized in that the lower layer (23, 23 ') has at least one cavity (35) which discovers a portion of the electrically conductive layer (33) of said substrate and has walls ( 40) electrically insulating silicon dioxide to grow an electrolytic deposition in said at least one cavity of the lower layer (23, 23 '). Moule selon la revendication 17, caractĆ©risĆ© en ce que la couche infĆ©rieure (23, 23') comporte en outre au moins un Ć©videment situĆ© communiquant avec ladite au moins une cavitĆ© de la couche infĆ©rieure (23, 23') et comportant des parois Ć©lectriquement isolantes permettant de continuer le dĆ©pĆ“t Ć©lectrolytique dans ledit au moins un Ć©videment aprĆØs avoir rempli ladite au moins une cavitĆ© de la couche infĆ©rieure (23, 23').Mold according to claim 17, characterized in that the lower layer (23, 23 ') further comprises at least one recess located communicating with said at least one cavity of the lower layer (23, 23') and having electrically insulating walls. for continuing the electrolytic deposition in said at least one recess after filling said at least one cavity of the lower layer (23, 23 ').
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